Sorry to hear it didn’t work for you. I am making the assumption your using the original pull which were from https://github.com/AdamMoses-GitHub/NPMJS-rt-scraper.
Unfortunately, I modified the original MMM-RottenTomatoes, so I don’t have a like for a like environment, but assumed correction would work for the original module.

The root of the problem is Rotten Tomato new web format, which is part of rt-scraper (which you found).

As indicate my fix were based on another user correction. You can attempt to pull or replace using his build.

https://github.com/parnic/NPMJS-rt-scraper

He has also updated his repo for RottenTomatoes module it self and updated the dependency. I haven’t tried it, but seem he best overall re-package solution.
https://github.com/parnic/MMM-RottenTomatoes

If that still doesn’t work and have time I can re-package my update, but it would be base on slight modified version of MMM-RottenTomatoes.

Rotten tomato changed to there web format recently. Small changes are needed to the NPMJS-rt-scraper index.js file to support the changes. My changes were base @Parnic changes.
Below is my update index.js replacing the installed package rt-scaper index.js will correct the issue.
https://github.com/haywirecoder/NPMJS-rt-scraper/blob/master/index.js.